Kinney, J. (2015). Dairy of a wimpy kid: Hard Luck. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Kinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. London: Penguin Books, 2015.
Lua MLA (9ú heag.)Kinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. Penguin Books, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.